Why is my 09 silverado shifting hard from 1st to 2nd intermittenly
My 09 silverado has been giving me a small transmission issue over the past couple months. From time to time, the transmission shifts hard from 1st to 2nd, as if a car is bumping me from the back. When it starts doing this, i pull over to the side and turn the truck off. I give it 10 seconds and then turn the truck back on, once i turn it back on the problem goes away and the truck shifts gears normally. It's as if the truck resets itself so the transmission starts working normally. I got 2 diagnostics done already, one said it was an electrical issue with the computer so i took it to the dealer to get the computer re-programmed and updated (re-flashed). When i took it to the dealer, they told me i had a transmission issue so i have to put a new one in. Having 2 complete different answers makes me unsure who to believe.
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